Print

Please login or register.
1 Hour 1 Day 1 Week 1 Month Forever
Login with username, password and session length

[Andy B]

.

 

[Entwood]

.

Talkative tonight .......    

[Andy B]

.

Talkative tonight .......    

No 


No longer a delete option 

[Shackeng]

Just as well, I like a bit of quiet.

[Andy B]

Just as well, I like a bit of quiet.

   

[Webby the Bear]

Evening fellas,

Had an awesome session today. A lot of stuff really clicked and it was nice cos its been a sort of ''catch up'' week where we've gone over any practical stuff we wanted to re-cover.

So this week I've done a DOHC timing belt (a big 1.8 mitsubooooshi if i'm right in thinking). difficult without the right tools... namely a cam locking tool  but i got there with a bit of grit, determination and a bit of ingenuity
did a crank sensor removal, test and replace. did this on a tigra and like the omega only god knows what i'd do if i actually had to remove the wire from the engine bay for a new one (we just disconnected it for testing purposes). its like wedged between the block and the crap coming off the bulkhead and below. that would be a nightmare!!!

most fun of all and something i was actually amazed by (little things) was testing ignition timing.....
this is a pic of the set up on the car.....strobe light gun connected to a second battery, the clamp hooked on to no.1 HT lead and just about to start the car ready to go.....

this is a photo of the strobe gun in action on the crank pulley... sorry its a bit dodgy but it was real hard getting a good photo...


now i shall explain how it works.

in that second photo you should be able to see by the pulley a little bit of plastic whith numbers 15, 10,  & 0

you check the spec on Autodata and this avensis' ignition timing was (or should be) 10o at idle... so basically the spark occurs 10o before TDC compression.
You set the gun's dial at 10o, turn the car on and point the gun at the crank pulley.
the timing notch/mark should then show 0. if it doesnt your ignition timing is off and should be investigated.

i'm taking the miggy in to school tomorrow for a good winter health check so i really wanna get the gun on it 

anyway, sadly i have no other updates but we have theory tomorrow so ill update what i learn then.

choi for now 

[Webby the Bear]

i should have mentioned that the gun fires a strobe light every time the spark occurs... and it knows this as its hooked up to no.1 HT lead.
soz thought i should mention that 

[Webby the Bear]

and sorry again 

but actually that 2nd pic is actually really good... you can actually see the crank mark at '0' when i flashed the light. didnt notice that before

[Marks DTM Calib]

Struggling to think of a car from the past 10-15 years that you cna set the timing on, or one these days that you can connect a timing light to!

Testing a crank sensor, did you have an oscilloscope then or was it a (another not so useful) resistance test?

[Webby the Bear]

Struggling to think of a car from the past 10-15 years that you cna set the timing on, or one these days that you can connect a timing light to!

Testing a crank sensor, did you have an oscilloscope then or was it a (another not so useful) resistance test?

yeah sorry mark, should've mentioned that if you find the timing to be out there isnt anything you can do  unless it was an oild school distributor other than replace a component... coilpack?

and yeah it was resistance checks 

[Marks DTM Calib]

Struggling to think of a car from the past 10-15 years that you cna set the timing on, or one these days that you can connect a timing light to!

Testing a crank sensor, did you have an oscilloscope then or was it a (another not so useful) resistance test?

yeah sorry mark, should've mentioned that if you find the timing to be out there isnt anything you can do  unless it was an oild school distributor other than replace a component... coilpack?

and yeah it was resistance checks 

Sadly, as per the resistance tests on the coil, they dont tell you to much on the crank sensor (not the most common failure mode).

As for change a component.....coil pack will make no difference, pretty much nothing that will (Ecu controls timing based on knock and crank position plus calculated enegine load)

[Webby the Bear]

Struggling to think of a car from the past 10-15 years that you cna set the timing on, or one these days that you can connect a timing light to!

Testing a crank sensor, did you have an oscilloscope then or was it a (another not so useful) resistance test?

yeah sorry mark, should've mentioned that if you find the timing to be out there isnt anything you can do  unless it was an oild school distributor other than replace a component... coilpack?

and yeah it was resistance checks 

Sadly, as per the resistance tests on the coil, they dont tell you to much on the crank sensor (not the most common failure mode).

As for change a component.....coil pack will make no difference, pretty much nothing that will (Ecu controls timing based on knock and crank position plus calculated enegine load)

thats interesting cos when i asked ''and why would you need to perform this test'' the answer was a bit vague lol

so i take it that in the real world if the timing was off (or you even got that far to check) it'd be a case of checking out any fault codes and if none then a replacement ECU? and furthermore i'm thinking off the top of my head that that shouldnt really happen anyway (or if it does it will be once in a blue moon)?

Thats ashame re the resistance tests. what sort of test should really be carried out?

[Marks DTM Calib]

Fault code analysis is a good start, live data might tell you something (less likely) but viewing the signal on a scope is the ultimate 

As for replacement ecu....if its running at all then its very unlikely to be the ecu

[Webby the Bear]

Fault code analysis is a good start, live data might tell you something (less likely) but viewing the signal on a scope is the ultimate 

As for replacement ecu....if its running at all then its very unlikely to be the ecu

looking in to scopes is our christmas homework 

but im wondering if theyve actually got one that we can look at data on 

[symes]

Keep one in the boot along with dwell meter along with carb=that way drive to drags change carb do timing undo headers and viola instant v8 roar  no use whatsoever on any car from late 90's though.